25621623 has 16 divisors (see below), whose sum is σ = 38158560. Its totient is φ = 16990848.

The previous prime is 25621619. The next prime is 25621637. The reversal of 25621623 is 32612652.

It is not a de Polignac number, because 25621623 - 2² = 25621619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25621643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 7727.

It is an arithmetic number, because the mean of its divisors is an integer number (2384910).

Almost surely, 2^25621623 is an apocalyptic number.

25621623 is a deficient number, since it is larger than the sum of its proper divisors (12536937).

25621623 is a wasteful number, since it uses less digits than its factorization.

25621623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5017 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 25621623 is about 5061.7806155542. The cubic root of 25621623 is about 294.8054755115.

It can be divided in two parts, 25621 and 623, that added together give a square (26244 = 162²).

The spelling of 25621623 in words is "twenty-five million, six hundred twenty-one thousand, six hundred twenty-three".